Friends of Marcus Landrum gather by a memorial for him in the 4900 block of West 45th Street in Chicago on Monday.

Friends of Marcus Landrum gather by a memorial for him in the 4900 block of West 45th Street in Chicago on Monday.

Tribune photo by Kuni Takahashi

Friends of Marcus Landrum gather by a memorial for him in the 4900 block of West 45th Street in Chicago on Monday. Landrum, 18, who would have turned 19 on Monday, was fatally shot by police as he was confronted on the grounds of the Chicago Housing Authority's LeClaire Courts homes in the Garfield Ridge community Sunday evening. Police say Landrum was armed.

Friends of Marcus Landrum gather by a memorial for him in the 4900 block of West 45th Street in Chicago on Monday. Landrum, 18, who would have turned 19 on Monday, was fatally shot by police as he was confronted on the grounds of the Chicago Housing Authority's LeClaire Courts homes in the Garfield Ridge community Sunday evening. Police say Landrum was armed. (Tribune photo by Kuni Takahashi)

Friends of Marcus Landrum gather by a memorial for him in the 4900 block of West 45th Street in Chicago on Monday. Landrum, 18, who would have turned 19 on Monday, was fatally shot by police as he was confronted on the grounds of the Chicago Housing Authority's LeClaire Courts homes in the Garfield Ridge community Sunday evening. Police say Landrum was armed.